Ultraviolet radiation absorbing compositions

Abstract

Sunscreen compositions are described which comprise a carrier having incorporated therein in an amount effective to provide protection against the harmful effects of ultraviolet radiation a compound of the formula: <IMAGE> wherein X is -O- or -NH-; R, R2, R3, R4, is H, CH3, -CN, -C2H5 and OH, -OCH3, -OC2H5; R' is selected from an alkyl, alkenyl, aryl or alkyl substituted aryl radical having 5-18 carbon atoms and the radical OR5 where R5 is an alkyl, alkenyl, aryl or alkyl substituted aryl radical having 6-18 carbon atoms.

What is claimed is: 
     
       1. A method for protecting a substrate against the harmful effects of ultraviolet radiation in the 290-400 nm range which comprises topically applying a composition as a clear liquid or lotion having uniformly dispersed therein an amount effective to provide protection against the harmful effects of ultraviolet radiation a compound having the formula: ##STR3## where X is --O-- or NH--; R, R 2 , R 3 , R 4  is --H, --CH 3 , --C 2  H 5  OH, --OCH 3 , --OC 2  H 5 , --OPh; R' is selected from the group consisting of an alkyl, an alkenyl, an aryl, or alkyl substituted aryl radical having 5-22 carbon atoms or OR 5  where R 5  is an alkyl, alkenyl, aryl, or alkyl substituted aryl radical having 1-22 carbon atoms. 
     
     
       2. A method of claim 1 wherein said compound is incorporated in said composition in an amount ranging from about 0.1 to about 50% by weight. 
     
     
       3. A method of claim 2 wherein said compound is incorporated in said composition in an amount ranging from about 1 to about 10% by weight. 
     
     
       4. A method of claim 1 wherein said compound is dissolved in said clear liquid or lotion. 
     
     
       5. A method of claim 1 wherein said carrier is an aqueous emulsion. 
     
     
       6. A method of claim 1 wherein said substrate is the skin of a warm-blooded animal. 
     
     
       7. A sunscreen composition which absorbs in the 290-400 nm range comprising a pharmaceutically acceptable clear liquid or lotion carrier having uniformly dispersed therein 0.1-50% by weight of a UV filter compound of the formula: ##STR4## wherein X is --O-- or --NH--; R, R 2 , R 3 , R 4  is --H, --CH 3 , --C 2  H 5  and --OH, --OCH 3 , --OC 2  H 5 , --OPh; R' is selected from the group consisting of an alkyl, alkenyl, aryl or alkyl substituted aryl radical having 5-22 carbon atoms and the radical OR 5  where R 5  is an alkyl, alkenyl, aryl or alkyl substituted aryl radical having 1-22 carbon atoms whereby said carrier and said UV filter do not interact to shift the effective absorption outside the 290-400 nm range. 
     
     
       8. A composition of claim 7 wherein R is H and R' is alkyl radical having 5 carbon atoms. 
     
     
       9. A composition of claim 8 wherein R' is isopentyl. 
     
     
       10. A composition of claim 7 wherein R 5  is 2-ethylhexyl. 
     
     
       11. A composition of claim 7 containing a mixture of furfurylidene n-amyl ketone with 2-ethylhexylfurylacrylate or 2-ethylhexylfurylmethacrylate.